Abstract
A novel and efficient preparation route of insulating gas-heptafluoroisobutyronitrile was developed. The synthetic route involved halogen-exchange fluorination, decomposition of bis-(perfluoroisopropyl) ketone and dehydration reaction. Overall, the desired compound was produced without the use of extremely toxic and expensive substances. Structures of the as-obtained products were determined by 19F NMR, 13C NMR, IR and GC-MS. The effects of several variables on reaction yield including nature of potassium fluoride, the catalyst dosage, temperature, solvent and molar ratio of raw materials were all investigated. The results indicated that the total yield of heptafluoroisobutyronitrile could reach 42% from original materials under optimal conditions and the mechanism of the reaction was proposed.
Highlights
SF6 is traditionally employed as an ideal insulating gas in gasinsulated switch gear (GIS) and gas-insulated transmission lines (GIL) owing to its superior chemical stability, excellent insulation properties and arc-extinct performance
We developed a novel synthesis route of C3F7CN
Oxalyl dichloride, acetonitrile, pyridine (Py), N, N-dimethyl formamide (DMF), KF.2H2O and KF were all received from Shanghai Aladdin Bio-Chem Technology Company. 18-crown-6 was purchased from Shanghai Macklin Biochemical and HFP from Chengdu Keyuan Gas Company
Summary
SF6 is traditionally employed as an ideal insulating gas in gasinsulated switch gear (GIS) and gas-insulated transmission lines (GIL) owing to its superior chemical stability, excellent insulation properties and arc-extinct performance. SF6 is a powerful greenhouse gas ranked as one of the six emission limiting gases in the Kyoto protocol. Searching for SF6 alternative gases or gas mixtures has received great attention both in industry and academia. Insulation properties and arc-extinct performances of some gases have been analysed, such as CO2, [6,7] N2, [8,9] CF3I [10] and c-C4F8 [11].
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call